TempStr=input ("请输入带有符号的温度值：")

if TempStr[-1] in ['F','f']:
        C=(eval(TempStr[0:-1])-32)/1.8
        print("转换后的温度是{:.2f}C".format(C))
elif TempStr[-1] in ['C','c']:
        F=1.8*eval(TempStr[0:-1])+32
        print ("转换后的温度是{:.2f}F".format(F))
else:
        print("输入格式错误")
    
